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    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
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    <title>Document</title>
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<body>
    <div id="app">
        <!-- template，同进同退 -->
        <template v-if="isadd">
        <p>11</p>
        <p>22</p>
        <p>33</p>
        <p>44</p>
      </template>
    </div>

    <script>
        var vm = new Vue({
            el: "#app",
            data: {
                isadd: true,
            },
        });
    </script>
</body>

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